Pneumatic tire and wheel therefor



Feb. 7, 192s. 1,658,708

J. M. DE AROSTEGUI E YBARGUENGOITA PNEUMATIC TIRE AND WHEEL THEREFOR Filed A1122. 5. 1925 Y Patented Feb. 7, 1928.

uNIrEDs'rATEs PATENT cintres.V

Josh' MANUEL` DE ARosTneUr E' YBARenNeorrIn, or BILBAO, seein.

PNEUMATIC TIRE ND WHEEL THEREIEOR.

Application filed August `5,` 1925, Serial No; 48,332, and in` Spain March 28, 1925.

This invention relates to pneumatic tires and wheelsl therefor and has tor its chiot object to provide an improved tire such that the tread can be replaced when desired.

Many methods for overcoming the disadvantages pertaining to the use ot pneumatic tires on the wheels ot motor vehicles have been suggested, butnone has proved successiul. The disadvantages consist mainly in the possibility of the puncturing' or bursting oit the tire, which naturally Cannot occur in material that, by its nature, cannot be deflated nor isliable to burst. Accord ingly, it is in the use ot means ot this hind that a substitute has been sought Yfor pneuu matic tires. The methods that dispense with pneumatic tires, however, apart Ytrom having detects ot their own, lack certain qualities inherent in the latter, such as elasticity, due to the air they contain, which no solid material can oitler in the same degree.

Thus, it pneumatic tires were not liable to punctures and bursting with the troublew not to mention the accidents-thereby entailed, it might be said that the ideal had been reached in this matter.

The mishaps mentioned are generally rare in pneumatic tires that are new, provided they have been properly fitted, tor their tread is then at its maximum thickness.

1 As the tire becomes worn with use, the

chances ot those mishaps occurring increase, i'or it is easier when they are somewhat worn, tor any pointed or sharp-edged body to penetrate through them and cause a puncture or tor them to burst as a consequence of the reduced resistance they otter to the eXpansion of the air enclosed in the inner tube, which expansion is due to the increase in temperature of the air by reason of the heat developed by the friction oi the lire against the road slu'l'aoe, the spread ot which tiro cannot be prevented by thev small amount oit rubber on the worn-out cover, which rubber is in itsell." a bad conifluctor oil' heat.

,Bursting may also be due to the tact that periphery with tooth members adapted to interlock with corresponding members onthe outer periphery of the tire.

A turther feat-ure of the invention consists .in the provision ot a vehicle wheel tor use with the improved tiro and provided with means tor preventing lateral displacement between the parts of the tire.

In order that the invention may be more clearly understood and readily carried into etl'ect reference may now be had to the ac companying drawing in which a preferred embodii'nent oit the invention is illustrated and in which Fig. 1 is a sectional view oi the improved tire and wheel and Fig. 2 an elevational view ot the improved tire and wheel.

To the hubl oit the wheel is attached the disc D having a rim L, into which the pneumatic tire casing N is fitted in the usual manner. The casing N is provided interiorly thereofwith the inner tube K adapted to contain air at suitable pressure. Attached to thecasing il by means of crowns provided with teeth-as may be seen in Fig. Q-is a solid tread portion M,- th'e outer surface or tread of which may be provided with any of the lnon-skid devices commonly used.`

The teeth may be arranged in any manner, the manner shown having been adopted, since it prevents any separation between the two crowns provided 'with teeth such as might be produced by the centrifugal iorce created upon movement ot the wheel. y

A similar purpose is served by the side guards C, one at either side of the Wheel, which prevent by means of edges B lateral displacement, with regard to the axle. of the wheel ot the outer rim or tread M with relspoot to the casing ll. The edges B are located opposite the toothed coupling, but in such a manner 'that they do not reach `to the ground when the tire is compressed by a load. The covering pieces Cl may be either :tull or perforated, as col'lsidcred most oonvenient.

In order that the wheel may bc littcd to any kind ot vehicle, the disc D need not be attached to the hub, but may be connected by means of bolts, or any other means, to the plate centres of the axles thus arranged. It may also be replaced altogether by a spohc wheel of suitable material.

.Aswill be gathered from the above, the

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fundamental part ot the invention lies in` the provision of a pneumatic tire having a detachable tread-portion and it may, therefore, be applied to any of the Wheels at present in use. y

The arrangement shown has `been 'chosen for the sake of clearness andbeeause itappears the most suitable and econoinicalwhen a new wheelhas to be made.V The riin L is preferably formed of angle irons attached to the dise D by through-bolts T so -as to facilitate the fitting-on of the pneumatic tire and lor the saine reason, the side guards C are connected to the disc by holtel of the saine kind T.

Should the tread become worn by use, it can easily be replaced by a new one, While retaining the sanie casing, 'or vice versa.

For transport use in War time, the system has `the advantage that, as the casingl is eapable ot' being protected by the side guards or sheaths, it is rendered immune late ally i'roni the elects of shots.

What I elailn is l. In combina-tion, a wheel and a pneumatie tire mounted thereupon, said tire including a laterally dis'ilaceable tread, and lneans carried by sai wheel to prevent inadvertent lateral escape of said tread, said means being normally outvot1 Contact `with said tire.

2. In a pneumatic tire, a easing havinpr spaced peripheral projections extending transversely thereacross, said project-innsl being; undercut to forni transverse recessesv at the front and rear, and a detaehalale tread litting theV periphery of said easing 4having projectionscorresponding to the spaece hetween the peripheral projections oit' said rasinp; provided with flanges dovetailing into the transverse recesses to prevent radial separation of said easing and tread by een trifilgal `force or the Wave-like stretching incident to the traclive thrust of the tire, the dovetailing portions being;r or' trapezoidal cross `section whereby acute angles are avoided.

In testimony whereof I have signed my naine to this specilication.

JOS MANUEL de ARsTEeUi e YBARGENGOHIA. 

